<template>
  <div>
    <div v-show="flag">全场清仓，全部5折</div>

    <ul>
      <li v-for="item in goods" :key="item.name">
        <div>{{ item.name }}</div>
        <div>{{ item.price * item.discount }}</div>
        <div>折扣：{{ item.discount * 100 }}%</div>
      </li>
    </ul>
    <button @click="discount">点击打折</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goods: [
        {
          name: 'mac电脑',
          price: '15000',
          discount: 1
        },
        {
          name: '百事可乐',
          price: '3',
          discount: 1
        },
        {
          name: '保温杯',
          price: '99',
          discount: 1
        },
        {
          name: '保暖手套',
          price: '130',
          discount: 1
        }
      ],
      flag: false
    }
  },
  computed: {},

  methods: {
    discount() {
      this.flag = !this.flag
      this.goods.forEach(item => (item.discount = 0.5))
    }
  }
}
</script>

<style scoped>
ul {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
  width: 200px;
  height: 80px;
  padding: 10px 0 0 0;
  border: 2px solid #333;
}
</style>
